8 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
posterior intestinal trunks, a condition that was present in fifty out of seventy- 
one specimens examined. In place of the two posterior trunks of the intes- 
tine, which exist in the ordinary Triclad type, there are often as many as three 
parallel trunks on each side of the pharyngeal chamber (Fig. 7). The acces- 
sory trunks either take their origin at the root of the pharynx, like the two 
normal posterior trunks, or exist as parallel branches of the latter, and 
usually unite with it and with each other close to their posterior termina- 
tions. I have never seen any anastomoses of the trunks of one side of the 
body with those of the other side, as in D. lacteum. When accessory trunks 
are present, they bear no lateral branches, but in place of these possess 
slight projections or buds, the lateral branches probably being suppressed 
through lack of space. The anterior portion of the intestinal tract, in almost 
every case where the specimens were not too heavily pigmented to be studied, 
estine in some instances 
exhibited anastomoses of the lateral branches, the int 
existing as a network (Fig. 7). (Sce under D. lacteum, ante, p. 2.) Unfortu- 
nately, I can say nothing in regard to the sexual organs of this species. In 
over one hundred individuals examined, not one was sexually mature or showed 
any signs of sexual organs. 
Girard (1893, p. 181) describes three varicties of Dugesia maculata. The 
description he gives of his first variety, var. a, agrees closely with the form 
described above in size and shape, in color, in the frequent occurrence of 
the light median streak, in the greater length of the auricular appendages, 
and the more pointed shape of these and the head end. His Figure 56 also 
shows a third posterior trunk of the intestine, but median in position and 
anastomosing with the lateral trunks. There can be little doubt that var. a 
of Girard’s D. maculata and P. dorotocephala are the same. 
There is also a striking resemblance between P. dorotocephala and Kennel’s 
figure of P. aurita (1888, Fig. 3). 
Planaria maculata Lery. 
Figures 2, 3. 
Planaria maculata Lutpy, 1848, p. 251; 1848*, p. 78; 1852, p. 225; 1852, p. 289; 
1885, p. 50. Dinsine, 1850, Vol. I. p. 205; 1862, p. 499. Srımpson, 1857, 
p. 28. SILLIMAN, 1885, p. 70. Woopwoxrn, 1896, p. 94; 18968, p. 240. 
Dugesia maculata GIRARD, 1851, p. 264; 1851°, p. 2; 1893, p. 181, var. b and c. 
Planaria tigrina GIRARD, 1851, p. 264; 1801 p. 2; 1891, p. 179. 
Anterior end pointed, sides of the head making an angle of about 60%. Two 
angular cephalic appendages. Length of head about 5 the total length of the 
animal. Eyes two. Sides parallel to about 4 of the total length from the 
anterior end, then tapering gradually to a rounded point. Color, blackish to 
purplish by reflected light ; blackish or gray by transmitted light. In smaller 
young specimens, the pigment occurs in isolated patches and spots; in older 
specimens the pigment patches become more confluent, chiefly in the median 
region leaving clear irregular areas scattered over the surface of the animal, 
